docs: resolve warnings

[mcepl]

Fixes these warnings:

> mitmanek~/r/r/docs (git: master)$ make html
Running Sphinx v8.2.3
loading translations [en]... done
[autosummary] generating autosummary for: configuration.rst, contributing.rst,
dev/issues.rst, index.rst, library.rst, overview.rst, release-process.rst, rope.rst
building [mo]: targets for 0 po files that are out of date
writing output...
building [html]: targets for 8 source files that are out of date
updating environment: [new config] 8 added, 0 changed, 0 removed
reading sources... [100%] rope
/home/matej/archiv/knihovna/repos/rope/rope/base/prefs.py:docstring of
rope.base.prefs.Prefs:1: WARNING: Inline emphasis start-string without end-string.
[docutils]
/home/matej/archiv/knihovna/repos/rope/rope/base/prefs.py:docstring of
rope.base.prefs.Prefs:1: WARNING: Inline emphasis start-string without end-string.
[docutils]
/home/matej/archiv/knihovna/repos/rope/rope/base/prefs.py:docstring of
rope.base.prefs.Prefs:1: WARNING: Inline emphasis start-string without end-string.
[docutils]
/home/matej/archiv/knihovna/repos/rope/docs/configuration.rst:73: WARNING: Title underline
too short.

imports.* Options
---------------- [docutils]
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
copying assets...
copying static files...
Writing evaluated template result to
/home/matej/archiv/knihovna/repos/rope/docs/_build/html/_static/basic.css
Writing evaluated template result to
/home/matej/archiv/knihovna/repos/rope/docs/_build/html/_static/documentation_options.js
Writing evaluated template result to
/home/matej/archiv/knihovna/repos/rope/docs/_build/html/_static/language_data.js
Writing evaluated template result to
/home/matej/archiv/knihovna/repos/rope/docs/_build/html/_static/js/versions.js
copying static files: done
copying extra files...
copying extra files: done
copying assets: done
writing output... [100%] rope
/home/matej/archiv/knihovna/repos/rope/docs/overview.rst:403: WARNING: Lexing literal_block
'def a_func():\n    a = 1\n    b = 2 * a\n    c = ${region_start}a * 2 + b *
3${region_end}' as "python" resulted in an error at token: '$'. Retrying in relaxed mode.
[misc.highlighting_failure]
/home/matej/archiv/knihovna/repos/rope/docs/overview.rst:424: WARNING: Lexing literal_block
'def a_func():\n    a = 1\n    ${region_start}b = 2 * a\n    c = a * 2 + b *
3${region_end}\n    print(b, c)' as "python" resulted in an error at token: '$'. Retrying
in relaxed mode. [misc.highlighting_failure]
/home/matej/archiv/knihovna/repos/rope/docs/overview.rst:1268: WARNING: Lexing
literal_block 'import mod1\n\narg = mod1.C1()\na_var =
mod1.func(arg)\na_var.${codeassist}\nmod1.func(mod1.C2()).${codeassist}' as "python"
resulted in an error at token: '$'. Retrying in relaxed mode. [misc.highlighting_failure]
generating indices... genindex done
writing additional pages... search done
dumping search index in English (code: en)... done
dumping object inventory... done
build succeeded, 7 warnings.

The HTML pages are in _build/html.
mitmanek~/r/r/docs (git: master)$

[codecov]

Codecov Report

❌ Patch coverage is 81.48148% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.24%. Comparing base (dbc61cb) to head (b2f8c56).

Files with missing lines	Patch %	Lines
rope/base/fscommands.py	0.00%	4 Missing ⚠️
rope/refactor/move.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #849   +/-   ##
=======================================
  Coverage   95.24%   95.24%           
=======================================
  Files         134      134           
  Lines       26292    26292           
=======================================
  Hits        25043    25043           
  Misses       1249     1249           

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